A worker presses his hand on a stack of molds while he waits for the cover to be lowered onto the vulcanizer. When the cover is secure, heat and steam will be piped into the vulcanizer, causing the rubber...

A tire with a visible inner tube leans against a stack of nearby tires. The invention of the pneumatic tire, i.e., a vulcanized tire with an inflatable inner tube gave passengers in automobiles a smooth,...